I was a volunteer first aid and CPR instructor for the red cross for almost two years. First they certified me in those classes (8 hours on a saturday. Then I was trained as a basic instructor and that I believe took 2 days of classes. At the end of each course, you have a multiple choice exam (very easy compared to anything you'll see in college!) And then finally you teach with an experienced co-instructor on your first night following a set notes that are given to you. And that was about it.